Malicious PDF — malware analysis report

Static analysis result for SHA-256 a889a89a36291b4e…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 12:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6dc001062c78301afdd49e007a61f17e SHA-1: 7c7bf61e4e839b548e841426154e85df6093d825 SHA-256: a889a89a36291b4ef415a240bc46e440fe3702ad0540071bdc4a3d96f53cb2d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is designed to redirect users to a network of potentially malicious sites. The ML classifier and ClamAV detection further support its classification as malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=pdf+special+characters PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153acc9152e5---panabo.pdfIn PDF document text
    • https://ms01bet.net/contents/files/depiroxujoto.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/notanirukuzi.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///55963852989.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615088e301b80---64030624928.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/jetegugugevulidolugu.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210929152617.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/mudejikigajepenibelegag.pdfIn PDF document text
    • https://ebmcordelles.progess.com/userfiles/file/46354777941.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/zagoxar.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kewijanumepiwexiwamo.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/zavimilezizaguwiletovof.pdfIn PDF document text
    • https://ibextrail.com/editor-images/lobelatumewekodutusuwor.pdfIn PDF document text
    • https://trexanh.net/upload/files/56639755795.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/58644061730.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/90885642194.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pokotereb.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lozixidosi.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/ziveguporaf.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/rurenabeku.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/61156841875.pdfIn PDF document text
    • https://alutat.com/data/file/vafoxuvorupa.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/nipuf.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/49852795459.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/9062363635.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 16160 bytes
SHA-256: cafc4d228939cdd4ee85c2347f2d448c57f7a8becfac077f476c24b2cd6302ef
font_02_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10492 bytes
SHA-256: 9bbc5e8cab9e1998fc9cdc6ce0e7d6d12c1b0acfc426a942c54c80338cd1daf9